While captaining a unit for Frederick, Kunz had his lands ravaged by William’s guys; eventually he even got outright captured and had to spring for a crippling 4,000-florin ransom.

The warring brothers settled things in 1451, but Kunz found to his fury that his postwar meaningful ahems around the Elector of Saxony did not meet with any compensation reciprocating the fortune ruined in the Elector’s service. (During the war Kunz had been given some captured property of one of William’s supporters, but the terms of the peace reverted everything to its original owner.)

Kunz skulked, and sued, and eventually Frederick flat-out banished him. But his grievance was never met, and in that day German nobles felt themselves entitled to force redress via feuds and private wars entirely alien to our post-Westphalian states.

Kunz’s personal contribution to the annals of noble vendetta was the Altenburg Prinzenraub — the Altenburg Prince-Robbery, which consisted of, well, robbing Frederick of his two sons Ernest** and Albert.

On the night of July 7-8, 1455, Kunz and his retainers snatched the two boys, aged 14 and 11 respectively, from Altenburg. The kidnapping went pear-shaped almost immediately: starting for Bohemia on the 8th, Kunz was captured by some concerned citizen or other, liberating Albert. Various legends make it monks, villagers, or a heroic collier.

His buddies took Ernest to an abandoned medieval mine shaft, today known as the “Prince Cave”. After holing up three days — and catching the news of Kunz’s ignominiously easy capture — this party arranged to turn Ernest back over in exchange for an amnesty, and scuttled away.

Kunz, of course, was not so lucky. A black paving-stone in Freiburg is said to mark the spot where his severed head came to rest on the 14th of July, 1455.

* Data point for the nature vs. nurture debate: the father of Frederick and William was known as Frederick the Belligerent or Frederick the Warlike.

** This is the “Ernest” referenced by the the Ernestine line — a lineage ancestor to present-day royal families of Belgium and Great Britain.